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A088979
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n!-((n-1)!!)^2.
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0
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1, 2, 15, 56, 495, 2736, 29295, 215424, 2735775, 25171200, 370945575, 4103654400, 68916822975, 891494553600, 16813959537375, 249145395609600, 5214921734397375, 87125481883238400, 2004231846526284375
(list; graph; refs; listen; history; internal format)
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